I made a freighter pack from an old external frame pack. I just used thin plywood for the shelf and clipped it to the frame with "one-hole" conduit clamps and carriage bolts with wing nuts. I used cable to attach the back of the shelf to the top of the frame but I think I would use nylon strap if I did it again. It doesn't look pretty but it works fine. You'll want a good padded hip belt or it may be a painful process.
I will admit, I love deer plots.
I love planting... even the garden at home.
What I do not like are high cost farm implements.
I found myself in need of a cultipacker for clover and other small seed - but could not find a decent deal on a small unit.
OK, fine... I will make one!
The materials were very simple... some plastic corrugated sewer drain pipe, some metal, 2 bearings and some concrete and you are in business!
I cut the pipe, in this case, to 46" wide - as I intended to pull this one...